HITCHCOCK AND CHASE—-NORTH AMERICAN PANICUM. 261 
DISTRIBUTION. 
Low sandy soil of the Coastal Plain, from southeastern Virginia to Florida and west 
to Louisiana; also in Guatemala and Cuba. 
Virainia: Dismal Swamp, Chase 3658. 
Nortu Carona: Parmele, Ashe in 1899; Wilmington, Hitchcock 1428, 1429, 
1434, 1440, Kearney 268. 
Souta Carona: Orangeburg, Hitchcock 1369, Aiken, Ravenel. 
Froripa: Baldwin, Hitchcock 990; Lake City, Combs 112, Hitchcock 1021, 1022; 
Bay Head, Combs 650; Old 
Town, Combs 854; Perdido 
Bay, Tracy 8409; Titusville, 
Chase 3966, Hitchcock 761; San- 
ford, Hitchcock 768, 823, 826; 
Eustis, Chase 4043, Hitchcock 
817, Nash 925; Orange County, 
Baker 119; Lemon Bay, Tracy 
7189; Miami, Hitchcock 639, 
666, 667, 670, 679, 714, 720; 
Homestead, Hitchcock 692; 
Tampa, Hitchcock 945; Lake- 
land, Hitchcock 838, 839, 848; 
Braidentown, Hitchcock 949, 963, Tracy 6733; Manatee, Rugel 184; Myers, 
Chase 4151, Hitchcock 870, 876, 880, 882, 884, 886. 
AtaBAMA: Tuskegee, Carver 97. 
MississipPi: Biloxi, Tracy 4605 in part (Gray Herb.). 
LovursiaNa: Calcasieu River, Langlois 42 in 1884. 
GuaTEMALA: Between Gualan and Copdn, Pittier 1805a. 
Cusa: Herradura, Hitchcock 555; Pinar del Rio, Wright 3463 in part (Sauvalle 
Herb.); Isle of Pines, Taylor 32. 
154. Panicum trifolium Nash. 
Fig. 284.—Distribution of P. albomarginatum. 
Panicum trifolium Nash, Bull. Torrey Club 26: 580. 1899. ‘‘Type collected by 
Dr. John K. Small, in the Ocmulgee River Swamp, below Macon, Georgia, May 18-24, 
1895.’? The type, in Nash’s herbarium, consists of two tufts of slender vernal culms, 
25 to 40 cm. high, with leafy bases and elongated internodes, the rather short-exserted 
panicles immature. 
DESCRIPTION. 
Vernal form similar to that of P. albomarginatum, but the culms in smaller tufts, 
taller, 20 to 50 cm. high, more slender, erect; leaves less conspicuously crowded at 
the base, not so stiff, and proportionately not so much longer than those of the mid- 
culm; sheaths much shorter than the elongated internodes; 
blades 3 to 5 cm. long, 4 to 5 mm. wide, rather less thick 
and firm than those of P. albomarginatum, the uppermost 
blade not reduced; panicles usually short-exserted, 3 to 5 cm, 
long, about as wide, loosely flowered; spikelets as in ?’. 
albomarginatum but hardly as wide or as turgid, and the 
fruit rather less exposed at maturity. 
Autumnal form erect or leaning, sparingly branching 
from the middle and upper nodes, the branches usually 
shorter than the primary internodes. 
This species is very closely allied to the preceding and some vernal specimens are 
but doubtfully separated from it. Autumnal specimens may be distinguished by the 
small fascicles of short branches scattered along the slender primary culm, 
Fia.285.—P. trifolium. From 
type specimen. 
